Arthur marichal



(No Model.) 4 I v vA. MARIGHAL' APPARATUS FOR CONVEYING HEAT T0 ENGINEGYLIITDFRS- No. 577,986. Patented Mar. 2, 1897-.

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I I I 7 NITED I STATES PATENT OFFICE.

ARTHUR MARIOHAL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THESOUTHIVARK FOUNDRY AND MACHINE COMPANY, OF SAME PLACE.

APPARATUS FOR CONVEYING HEAT TO ENGINE- CYLINDERS.

SPECIFICATION forming part of Letters Patent No. 577,986, dated March 2,1897.

Application filed August 24,1893. Serial No. 483,900. (No model.)

To all whom it may concern.-

Be it known that I, ARTHUR MARIoHAL, a subject of the King of theBelgians, and a resident of Philadelphia, State of Pennsylvania, haveinvented a certain new and useful Improvement in Apparatus for ConveyingHeat to Engine-Cylinders, of which the following is a true and exactdescription, reference being had to the accompanying drawing, whichforms a part of this specification.

My invention relates to the transmission of heat to engine-cylinders,and has for its object to convey heat to engine-cylinders in a wayanalogous to the use of a steam-jacket, but free from the drawbacksincident to the use of steam for that purpose.

My invention consists in devices for surrounding an engine-cylinder withan inclosed body of air and communicating heat to the air and through itto the cylinder by repeated compression of the inclosed body of air. Inmy device the body of air surrounding the cylinder is connected bothwith the admission and delivery ends of the pump and permitted to escapefrom the cylinder to the admission valve or valves of the air-pump whenits pressure exceeds a determined amount. Thus the loss of heat whichwould be incident to permitting the inclosed body of air to escape tothe atmosphere is avoided. The method of communicating heat to theengine-cylinder as carried out in my construction has the advantage overthe usual use of the steam for the same purpose of being more easilyregulated with regard to temperature, of requiring less pressure for adesired temperature, and of avoiding the steam connections which arenecessary when steam is used.

My invention further consists in certain details and constructionsembodying in themselves novelty.

Theseimprovements are shown in the drawing, which represents insectional elevation an engine-cylinder and connections adapting it to beheated by compressed air, and in which A is the cylinder of asteam-engine, and B a jacket surrounding it, as in the case of asteam-jacket.

O is the piston; D, the piston-rod; E, an air-pump, here shown asdouble-acting,hav-

ing entrance-valves F F and exit-valves G G, H being the piston of thepump, worked by a rod H, which in turn is actuated by a moving part ofthe engine. As shown, it is connected by an arm I with the piston-rod D.From each delivery-valve a conduit J J leads to a common conduit J,which in turn connects with the jacket B. As shown, the connection isthrough a coil J 4 and extension J but of course the conduit J can beconnected directly, as shown in dotted lines, with the part J whichenters the jacket. I have shown the coil J forming part of theconnection and situated in a furnace K to indicate that my invention isnot limited to a construction in which the desired heat is imparted tothe air by compression alone, but includes as well devices for heatingthe compressed air on its way from the pump to the jacket. It will beunderstood, however, that practically any desired temperature can beimparted to the air by means of the conversion of the energy of the pumpinto heat in the act of compressing the air.

In the construction shown the pump is arranged to act at each impulseupon a new body of air sucked in from conduit L. Oonsequently thepressure in jacket B is due not only to increase of temperature, but tonew volumes of air, and it is necessary to provide means for allowingthe air to escape when it reaches a determined pressure, and this I doby means of a snifter-valve M. To prevent loss of heat, however, Iconduct the air issuing from said snifter-valve to the feed-conduit Lotthe pump, and I arrange a valve N in said conduitin' such a Way that itwill open to admit air to said conduit when the pressure in the conduitfalls below a determined amount, but will close and remain closed whenthe conduit and pump are sufliciently supplied with air coming from thesniftervalve M in the jacket. By this arrangement it will be seen thatpractically no air is permitted to escape from the apparatus and that 5the same body is constantly subjected to the action of the pump, exceptthat at times some new air is permitted to enter the apparatus, as whenthe pressure in pipe L falls below thatof the atmosphere.

ICO

Having now described my invention, What I claim as new, and desire tosecure by Letters Patent, is

l. The combination of an engine-cylinder having a jacket B surroundingit, of an airpump, a conduit leading from the pump to the jacket B, anda conduit as L leading from the jacket to the suction side of the pump,said jacket having no outlet save that leading to the pump and so thatthe body of air inclosed is constantly acted on by the pump Withoutbeing permitted to escape.

2. The combination with an engine-cylinder having a jacket as Bsurrounding it, of an air-pump, a conduit leading from the pump to thejacket B, a return-conduit L leading from the jacket to the entranceport or ports of the pump, and a snifting-valve controlling the passageof gas from the jacket to conduit L.

3. The combination with an engine-cylinder having a jacket as Bsurrounding it, of

an air-pump, a conduit leading from the pump to the jacket B, areturn-conduit L leading from the jacket to the entrance port or portsof the pump, a shifting-valve controlling the passage of gas from thejacket to conduit L, and a valve N situated in conduit L and arranged togive access to the same from the air when the pressure in said conduitfalls below a determined amount.

4. The combination with an engine-cylinder having a jacket as Bsurrounding it, of an air-pump and furnace and conduit leading from thepump to the furnace, through the furnace to the jacket B, areturn-conduit L leading from the jacket to the entrance port or portsof the pump, and a snifting-valve controlling the passage of the gasesfrom the jacket to conduit L.

ARTHUR MARICHAL.

Witnesses:

ALF. H. FABER, EDW. F. AYRES.

